PSU ASTRO 7N ACTUAL EXAM UPDATED QUESTIONS
AND ANSWERS GRADED A+
✔✔Milky Way Stars - ✔✔About 400 billion stars
✔✔Most Common Milky Way Stars - ✔✔Red M-type stars
✔✔Milky Way Diameter - ✔✔About 100000 light-years
✔✔Sun's Position - ✔✔About 26000 light-years from galactic center
✔✔Milky Way Components - ✔✔Bulge, disk, halo
✔✔Disk - ✔✔Spiral region with young blue stars and star formation
✔✔Bulge - ✔✔Central spherical region with older yellow stars
✔✔Halo - ✔✔Large spherical outer region with old stars and globular clusters
✔✔Open Clusters Location - ✔✔Disk
✔✔Globular Clusters Location - ✔✔Halo
✔✔Large Magellanic Cloud - ✔✔Satellite dwarf galaxy of the Milky Way
✔✔Small Magellanic Cloud - ✔✔Satellite dwarf galaxy of the Milky Way
✔✔Andromeda Galaxy Distance - ✔✔About 2.5 million light-years away
✔✔Local Group - ✔✔Contains Milky Way, Andromeda, and about 40 dwarf galaxies
✔✔Milky Way-Andromeda Collision - ✔✔Will occur in about 5 billion years
✔✔Spiral Galaxies - ✔✔Have gas, dust, active star formation, and disks
✔✔Elliptical Galaxies - ✔✔Older stars, less gas and dust, little star formation
✔✔Irregular Galaxies - ✔✔No clear shape
✔✔Barred Spiral Galaxy - ✔✔Spiral galaxy with central bar structure
✔✔S Galaxy - ✔✔Spiral galaxy without central bar
, ✔✔SB Galaxy - ✔✔Spiral galaxy with central bar
✔✔Sa Galaxy - ✔✔Large bulge with tightly wound arms
✔✔Sb Galaxy - ✔✔Medium bulge with moderate arms
✔✔Sc Galaxy - ✔✔Small bulge with loose arms
✔✔E0 Galaxy - ✔✔Nearly circular elliptical
✔✔E7 Galaxy - ✔✔Highly elongated elliptical
✔✔Observable Universe Galaxies - ✔✔About 50 to 100 billion galaxies
✔✔Hubble Deep Field - ✔✔Observation used to estimate galaxy numbers
✔✔Neutron Star Size Comparison - ✔✔About 10000 times larger than a person
✔✔Earth Size Comparison - ✔✔About 10 million times larger than a person
✔✔Nebula vs Star Size - ✔✔Nebulae are millions of times larger than stars
✔✔Galaxy vs Star Size - ✔✔Galaxies are billions to trillions of times larger than stars
✔✔Observable Universe vs Milky Way - ✔✔About 1 million times bigger
✔✔Galaxy Evolution - ✔✔Study of how galaxies change over time
✔✔Looking Farther in Space - ✔✔Means looking back in time
✔✔Early Universe Galaxies - ✔✔Mostly irregular and still forming
✔✔Galaxy Collision Result - ✔✔Can create elliptical or irregular galaxies
✔✔Starburst Galaxy - ✔✔Galaxy with intense star formation triggered by collision
✔✔Galaxy Collision Effect on Stars - ✔✔Individual stars rarely collide
✔✔Redshift - ✔✔Stretching of light to longer wavelengths due to motion away
✔✔Blueshift - ✔✔Shift to shorter wavelengths due to motion toward observer
AND ANSWERS GRADED A+
✔✔Milky Way Stars - ✔✔About 400 billion stars
✔✔Most Common Milky Way Stars - ✔✔Red M-type stars
✔✔Milky Way Diameter - ✔✔About 100000 light-years
✔✔Sun's Position - ✔✔About 26000 light-years from galactic center
✔✔Milky Way Components - ✔✔Bulge, disk, halo
✔✔Disk - ✔✔Spiral region with young blue stars and star formation
✔✔Bulge - ✔✔Central spherical region with older yellow stars
✔✔Halo - ✔✔Large spherical outer region with old stars and globular clusters
✔✔Open Clusters Location - ✔✔Disk
✔✔Globular Clusters Location - ✔✔Halo
✔✔Large Magellanic Cloud - ✔✔Satellite dwarf galaxy of the Milky Way
✔✔Small Magellanic Cloud - ✔✔Satellite dwarf galaxy of the Milky Way
✔✔Andromeda Galaxy Distance - ✔✔About 2.5 million light-years away
✔✔Local Group - ✔✔Contains Milky Way, Andromeda, and about 40 dwarf galaxies
✔✔Milky Way-Andromeda Collision - ✔✔Will occur in about 5 billion years
✔✔Spiral Galaxies - ✔✔Have gas, dust, active star formation, and disks
✔✔Elliptical Galaxies - ✔✔Older stars, less gas and dust, little star formation
✔✔Irregular Galaxies - ✔✔No clear shape
✔✔Barred Spiral Galaxy - ✔✔Spiral galaxy with central bar structure
✔✔S Galaxy - ✔✔Spiral galaxy without central bar
, ✔✔SB Galaxy - ✔✔Spiral galaxy with central bar
✔✔Sa Galaxy - ✔✔Large bulge with tightly wound arms
✔✔Sb Galaxy - ✔✔Medium bulge with moderate arms
✔✔Sc Galaxy - ✔✔Small bulge with loose arms
✔✔E0 Galaxy - ✔✔Nearly circular elliptical
✔✔E7 Galaxy - ✔✔Highly elongated elliptical
✔✔Observable Universe Galaxies - ✔✔About 50 to 100 billion galaxies
✔✔Hubble Deep Field - ✔✔Observation used to estimate galaxy numbers
✔✔Neutron Star Size Comparison - ✔✔About 10000 times larger than a person
✔✔Earth Size Comparison - ✔✔About 10 million times larger than a person
✔✔Nebula vs Star Size - ✔✔Nebulae are millions of times larger than stars
✔✔Galaxy vs Star Size - ✔✔Galaxies are billions to trillions of times larger than stars
✔✔Observable Universe vs Milky Way - ✔✔About 1 million times bigger
✔✔Galaxy Evolution - ✔✔Study of how galaxies change over time
✔✔Looking Farther in Space - ✔✔Means looking back in time
✔✔Early Universe Galaxies - ✔✔Mostly irregular and still forming
✔✔Galaxy Collision Result - ✔✔Can create elliptical or irregular galaxies
✔✔Starburst Galaxy - ✔✔Galaxy with intense star formation triggered by collision
✔✔Galaxy Collision Effect on Stars - ✔✔Individual stars rarely collide
✔✔Redshift - ✔✔Stretching of light to longer wavelengths due to motion away
✔✔Blueshift - ✔✔Shift to shorter wavelengths due to motion toward observer
